HI, developed a constant metallic taste on tongue tow days ago. Prior to that it was intermittent for a few weeks. Had some dental work in April, a cap on last molar, seeing denitist in two days in case there is some kind of infection there, or maybe failure of older fillings. Any other causes? it's pretty strong, rinsing with salt, and drinking lemon in water which seems to help for awhile but it's back in an hour or so. Thanks!